FTM Need opinions / Advice

Brittanie
My original due date was 8/16/17 but at my third (and final) sonogram the estimated that the baby is 5 pounds, and he's measurements were about two weeks ahead of time, and his head was measuring 9cm which apparently is normally the measurement at 35-36 weeks, they said that he's head down and ready to go, but they didn't really make any comments about him coming earlier then the 16th, and I've become a little anxious about how big he will become in all the time he has left or if he will come early, and I was hoping some other moms could either give me their opinions or advice, because I don't see myself carrying him until 8/16 my body already feels so defeated, I was fairly small when I became pregnant 125 pounds and I'm about 175 now, my body feels like it's going to give out lol, I'm very happy my boy is healthy and growing, just curious what other moms have to say about his measurements or maybe someone from a similar experience 💓☺️ thank you!!
Oh and at this sonogram I was 32 weeks and no I'm just about 33! Sorry forgot to add that